Photonic crystal fibre source of photon pairs for quantum information processing

Abstract

We demonstrate two key components for optical quantum information processing: a bright source of heralded single photons; and a bright source of entangled photon pairs. A pair of pump photons produces a correlated pair of photons at widely spaced wavelengths (583 nm and 900 nm), via a ${\chi }^{(3)}$ four-wave mixing process. We demonstrate a non-classical interference between heralded photons from independent sources with a visibility of 95%, and an entangled photon pair source, with a fidelity of 89% with a Bell state.

4 pages, 3 figures

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• Heralded Generation of Ultrafast Single Photons in Pure Quantum States
• Tailored photon-pair generation in optical fibers
• Conditional preparation of single photons using parametric downconversion: A recipe for purity
• Nonclassical 2-photon interference with separate intrinsically narrowband fibre sources
• Collinear source of polarization-entangled photon pairs at non-degenerate wavelengths
• Optimizing H1 cavities for the generation of entangled photon pairs
• Fiber based source of photon pairs at telecom band with high temporal coherence and brightness for quantum information processing
• Ultra-broadband photon pair preparation by spontaneous four wave mixing in dispersion-engineered optical fiber
• Bell inequalities and density matrix for polarization entangled photons out of a two-photon cascade in a single quantum dot
• Recent developments in quantum key distribution: theory and practice